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On the 2nd experiment, I will keep loading weights until near breaking point.
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The 3rd experiment I will put as many masses on until it breaks. I will also record all my results on a table every 100g.
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Once I have all my results I will then take the weights off 1 by 1 to see if the elastic band returns to its original form. I will only do this for the 1st and 2nd experiment.
Safety:
- I will have to wear goggles so when the elastic band snaps it won’t flick in my eye.
- I will use a G Clamp so the equipment won’t fall.
- I won’t put my feet under the table as the weights might fall.
Fair Test:
I will make this a fair test by:
- I will make the results accurate.
- I will use the same equipment.
- I will keep the ruler at the same height
Prediction:
First Experiment:
The elastic won’t break, as there won’t be enough mass to break it, and I predict that the elastic will return to it’s original size.
Second Experiment:
The elastic will be near breaking point, but I don’t think it will go back to it’s original size.
Third Experiment:
Will break near 2000g’s.
Conclusion:
I found out that the elastic bands do follow Hookes Law, and my graph 1 wasn’t successful, but my 3rd graph was the most successful, and I felt my experiments were accurate.
On my 3rd graph I see a pattern where the graph goes rapidly up, and near the end it starts to level out. On my 2nd graph the line goes steadily up.
My graphs do follow Hookes Law, but I think I would like to repeat the experiment so I could make my results more accurate, as I feel some of my results could have been more accurate.
My elastic band limit was 2600g, as 2700g it broke.
My elastic band did go back to it’s original form which was very surprising considering how much weight it had on it.
Evaluation:
My results were reliable, but to get my results more accurate I would like to repeat the experiment, my rules was moving too much, so I think I could have had another person to hold the ruler, this would prevent the ruler from moving about, and would make my results more accurate.
I did get some unusual results on my graphs, but I am not sure what caused them, I feel it was to do with my inaccurate results. For improvements I would repeat the experiment, and I would take more time over it, especially when I measured with a ruler. I feel overall I have had really good results but for the best results I would need more time so I could get more accurate results.